Some cursory Googling seems to reveal this as a controversial talking point. The most balanced source I found was an NPR article that questioned the accuracy t

Some cursory Googling seems to reveal this as a controversial talking point. The most balanced source I found was an NPR article that questioned the accuracy these claims, but not necessarily the conclusions. http://www.npr.org/sections/13.7/2013/02/03/170851048/do-we-really-know-that-cats-kill-by-the-billions-not-so-fast http://www.npr.org/sections/13.7/2013/02/03/170851048/do-we-... I'm interested to see what sources others might find.